Carbon shafted reaming device

ABSTRACT

A carbon shafted reaming device includes a rod element, an interface element and a connecting agent. The rod element comprises a first connecting portion having a carbon fiber reinforced structure, wherein the interface element comprises a second connecting portion. The first connecting portion and the second connecting portion are concentrically arranged to each other, and wherein the connecting agent is interposed between the first connecting portion and the second connecting portion. Either of the rod element and the interface element may be coupled to a reaming tool or a drive.

FIELD OF THE INVENTION

The present invention relates to a reaming device, and in particular toa reaming device having a shaft with a carbon fibre reinforcedstructure.

BACKGROUND OF THE INVENTION

Intramedullary nailing is the method of choice for the fixation offractures in long bones, in particular in long extremities. To have afull access to the intramedullary channel, a shaft of a reamer has to beflexible enough in a bending direction to bypass soft tissue and bonecurvature, and has also to be rigid enough to convey torsion to thereamer head. Prior art reaming devices have a shaft design consisting ofa helix in which residues can be trapped during the reaming procedure,so that the cleaning of the reaming device in hospitals prior to thenext usage is complicated, in particular for a sterilisation process.The adequate cleaning of the instrument in hospitals demands a higheffort and takes a lot of time. Further, some hospitals are not preparedto clean such critical devices because of the high effort involved.

In some prior art reaming devices, a helix shaft is replaced by a shaftmade of so called nitinol, which is a material having a high degree ofelasticity (super elasticity) to provide enough flexibility. Nitinol isan akronym for NIckel TItanium Naval Ordnance Laboratory. Nitinol is theinter-metallic phase NiTi having a regular cubic crystal structure beingdifferent of the structure of titanium or nickel. Nitinol comprisesabout 55% nickel and about 45% titanium. Owing to the fact that thenitinol shaft is made of a single tube, the cleaning effort in thehospital is less exhausting. However, recent investigations have shownthat the nitinol material has a catastrophic failure mode. Inparticular, some reports have pointed out that some breakages inmultiple fragments of the nitinol shaft occurred during the reamingprocess during the operation process in hospitals. Further, the nitinolmaterial is a very expensive material.

From US 2007/0015107, a root canal instrument having an abrasive coatingand method for the production thereof is known, wherein the describedroot canal instrument has a core of a flexible elastic material having ashape memory, wherein the core furthermore has a coating with abrasiveparticles, wherein the core is made from a nickel-titanium alloy or froma plastic material, e.g. carbon fibre reinforced plastics material.

CH 668690 describes a probe electrode cable for medical purposes, e.g.electro cardiogram test, using carbon fibre impregnated plasticinsulating coating as a cover with a lead coupled to the test equipment.

SUMMARY OF THE INVENTION

It may be seen as an object of the present invention to provide a morereliable reaming device.

The object of the present invention is solved by the subject matter ofthe independent Claims. Advantageous embodiments thereof areincorporated in the dependent Claims.

According to an exemplary embodiment of the invention, a reaming devicecomprises a rod element, an interface element and a connecting agent,wherein the rod element comprises a first connecting portion having acarbon fibre reinforced structure, wherein the interface elementcomprises a second connecting portion, wherein the first connectingportion and the second connecting portion are concentrically arranged toeach other, and wherein the connecting agent is interposed between thefirst connecting portion and the second connecting portion.

Thus, a reaming device is provided, which does not have the cleaningproblem of the spiral reamer of the prior art, and providing at the sametime a more robust material due to the carbon fibre reinforced structureof the rod element. Further, the rod element having a carbon fibrereinforced structure portion is cheaper than the nitinol material of theprior art, and further much more robust. The connecting agent provides areliable connection between the rod element and the interface element.The interface element may be a coupling element being capable ofcarrying a reaming tool of a reaming device, but may also be a couplingto a reaming drive of the reaming device. In other words, the interfaceelement may be a coupling on both sides of the reaming device, on thedrive input side and the drive output side of the reaming device. Theconnecting portions, i.e. the first connecting portion and the secondconnecting portion may be particularly prepared for receiving theconnecting agent in order to provide a reliable connection between therod element and the interface element.

According to an exemplary embodiment of the invention, the firstconnecting portion is provided on an outer surface of the rod element,and the second connecting portion is provided on an inner surface of theinterface element.

Thus, the connection portion of the rod will be at least partiallysurrounded by the interface element, so that the interface elementcovers the connecting portion of the rod element. However, the firstconnecting portion may also be provided on an inner surface of the rodelement, and the second connecting portion may be provided on an outersurface of the interface element. In this case, the rod element shouldbe provided with a hole, into which the interface element may beinserted, in particular into which the second connecting portion of theinterface element may be inserted. In both of the previously describecases, the transit from the rod element to the interface element or viceversa may be designed as a smooth transit in order to avoid portionsbearing the risk of trapping ablated tissue, which may be problematicwith respect to the cleaning process of the reaming device.

According to an exemplary embodiment of the invention, the firstconnecting portion comprises a first recess, wherein the connectingagent engages into the first recess.

Providing the first connecting portion of the rod element with a recessprovides an improved force transmission during the operation of thereaming device, since the force transmission is not limited to the shareforces affecting between the connecting agent and the surface of the rodelement on the first connecting portion. Moreover, the forces may alsobe transmitted by the interaction between a protrusion of the connectingagent engaging into the recess and the recess itself.

According to an exemplary embodiment of the invention, the first portioncomprises a second recess, wherein the first recess and the secondrecess are displaced to each other in an axial direction of the rodelement.

The provision of a second recess being displaced with respect to thefirst recess in an axial direction allows to form a further protrusionof the connecting agent so that a force distribution may be improved.The provision of a displacement into an axial direction furtherdistributes the force impact locations to different axial positions, sothat the weakening of the rod element in the area of the firstconnecting portion may be limited in order to avoid a break of the rodelement.

According to an exemplary embodiment of the invention, the first portioncomprises a third recess, wherein the first recess and the third recessare displaced to each other in a circumferential direction of the rodelement.

The provision of several recesses being displaced in a circumferentialdirection may further improve the distribution of the transmittingforces in order to form an improved contact between the rod element andthe interface element.

According to an exemplary embodiment of the invention, the interfaceelement, in particular the second connection portion, comprises a fourthrecess, wherein the connecting agent engages into the fourth recess.

The provision of a recess in the interface element provides also animproved force transmission between the connecting agent and therespective interface element.

According to an exemplary embodiment of the invention, the interfaceelement, in particular the second connecting portion comprises a fifthrecess, wherein the fourth recess and the fifth recess are displaced inan axial direction of the interface element.

The displacement of the fourth and fifth recess provides an improvedforce distribution in order to improved the force transmission betweenthe connecting agent and the interface element. The provision of anaxial displacement of the recesses may avoid a weakened structure of theinterface element and to distribute the force transmission to aplurality of axially distributed locations.

According to an exemplary embodiment of the invention, the interfaceelement comprises a sixth recess, wherein the fourth recess and thesixth recess are displaced in a circumferential direction of theinterface element.

The provision of several recesses displaced in a circumferentialdirection may provide an improved geometry with respect to the forcetransmission between the connecting agent and the interface element.

It should be noted that a plurality of recesses may be provided whichare displaced in both directions, an axial direction and acircumferential direction at the same time. Further, the number ofrecesses is not limited and may be provided according to the respectiveneed of the application. Further, it should be noted that the connectingagent may engage into the several recesses, in particular also into thesecond, third, fifth and sixth recess, in order to improve the forcetransmission between the rod element and the interface element via theconnecting agent. It should be further noted, that the recesses in therod element and the recesses in the interfaces may at least partiallycorrespond to each other with respect to the location of recesses, sothat the recesses may face to each other. Thus, the respectivelyengaging portions of the connecting agent may form a kind of boltingconnection between the rod element and the respective interface element.Further, it should be noted that, for example, the third recess may beprovided even if there is no second recess, and that a fourth recess maybe provided even if there is no first, second or third recess, and soforth. In other words, the recesses may be provided arbitrarily withrespect to the need of the respective application.

According to an exemplary embodiment of the invention, at least one ofthe recesses is formed in a shape of a spherical hole.

The provision of a spherical hole provides the advantage over acylindrical hole, in that the spherical hole does not provide any sharpchamfer or notch, which sharp chamfer or notch bears the risk of abreakage of the rod element. Thus, by means of a recess in form of aspherical hole a sharp notch or a sharp chamfer may be avoided.

According to an exemplary embodiment of the invention, at least one ofthe recesses is formed in a shape of a groove, which groove extends intoa longitudinal direction of the rod element.

A groove extending in an axial direction has a larger cross-section thana hole, and therefore may provide an improved force transfer between therespective elements. It should be noted that the groove may have across-section of a half circuit in order to avoid sharp notches or sharpchamfers in order to avoid an unintended breakage of the respectiveelements.

According to an exemplary embodiment of the invention, at least onerecess forms a through-hole in the interface element.

The provision of a through-hole is much easier to manufacture than ablind hole, in particular when providing such a hole into the inner wallportion of an axial directed bore hole.

According to an exemplary embodiment of the invention, the interfaceelement is adapted to couple a reaming tool to the rod element.

It should be noted that the interface element may also be adapted tocouple a drive to the rod element. With providing two interfaceelements, a first interface element for coupling a reaming tool and asecond interface element as a coupling for a drive, the design, inparticular the geometry of the connecting agent of both connectionsbetween the rod element and the interface element on the reaming toolside and the interface element on the drive side may be designed suchthat the connecting agent provides a predetermined breaking point on thedrive side. Thus, if the driving forces extend over the capability ofthe intended limited force transmission of the connection between therod element and the respective interface elements, the predeterminedbreaking point will be provided on the side of the driving interfaceelement, so that during the operation procedure on or in a human body,the breakage takes place outside the human body, so that no residues ofthe reaming device remain in the human body. The predetermined breakingpoint may be provided by, for example, by a reduced number of recesseson the drive side with respect to the reaming tool side.

According to an exemplary embodiment of the invention, the rod elementcomprises a first conduit extending in a substantially longitudinaldirection of the rod element.

The provision of a conduit within the rod element provides thepossibility to provide a medical effective agent from the outside to thereaming tool side of the rod element and the respective coupledinterface element. On the other hand, the conduit in the rod elementprovides the possibility to remove the ablated tissue from the reamingtool side to the outside.

According to an exemplary embodiment of the invention, the interfaceelement comprises a second conduit, which conduit being connected to thefirst conduit of the rod element.

Thus, the second conduit in the interface element corresponds to thefirst conduit of the rod element, so that the material being transportedthrough the conduit may be transferred from the interface element to therod element and vice versa. A conduit may be provided for both kinds ofinterface elements, the interface element as a coupling for a reamingtool and the interface element as a coupling to the drive. It should benoted that the outlet of the conduit of the interface elements may alsobe provided on the outer wall side, i.e. on the lateral portion of theinterface element, in particular when the provision of an agent isdesired or the removal of tissue is desired.

According to an exemplary embodiment of the invention, the rod elementis made from a carbon fibre composite (CFC).

According to an exemplary embodiment of the invention, the carbon fibresare wound in at least a first layer and a second layer, wherein thedirection of the first layer and the second layer are inclined at anangle of substantially plus/minus 45°, respectively, with respect to alongitudinal axis of the rod element.

Thus, the carbon fibres are optimised to have a maximum torsionalresistance together with a low bending resistance. It should be notedthat also different inclination angles of the direction may be provided,if there is a need to adapt the torsional resistance and the bendingresistance as well as the ratio of the torsional resistance and thebending resistance.

According to an exemplary embodiment of the invention, the connectingagent is an adhesive.

The adhesive provides a reliable connection between the rod element andthe interface element. It should be noted that for a reaming device anadhesive should be used which is compatible with respect to the humanbody. An appropriate adhesive should be an adhesive which provides areliable connection and a bio-compatibility at the same.

According to an exemplary embodiment of the invention, the connectingagent is a thermal hardening adhesive.

A thermal hardening adhesive provides the possibility of a longermanufacturing period, so that when obtaining the correct positioning ofthe rod element and the interface element to each other, the hardeningprocess may be started, initiated by a heat impact.

According to an exemplary embodiment of the invention, the connectingagent is a multiple component epoxy resin.

Multiple component epoxy resins provide a reliable and strong connectiondue to the chemical process starting when mixing the multiple componentsof the epoxy resin or when impacting a heat. Thus, an ageing process oran early binding of the adhesive may be avoided.

According to an exemplary embodiment of the invention, the connectingagent is a third layer of carbon fibre, which third layer is woundaround the first layer and the second layer, wherein the third layer iswound into a circumferential direction of the rod element. It should benoted that the first layer and the second layer of the carbon fibre donot have to be separated, and may also constitute an interwovenstructure. However, if the carbon fibres are inclined with respect to asolely circumferential direction, the stability of the structure may beweakened, so that the winding of a third carbon fibre layer in acircumferential direction provides a sufficient stable structure, inparticular when the third carbon layer serves as a connecting agent. Thethird carbon layer may serve as a connecting agent in cases, the rodelement and the interface element are connected by a press fitting,which does not need an adhesive for a reliable connection between therod element and the interface element.

It should be noted that the above features may also be combined. Thecombination of the above features may also lead to synergetic effects,even if not explicitly described in detail.

These and other aspects of the present invention will become apparentfrom and elucidated with reference to the embodiments describedhereinafter.

BRIEF DESCRIPTION OF THE DRAWINGS

Exemplary embodiments of the present invention will be described in thefollowing with reference to the following drawings.

FIG. 1 illustrates an exemplary embodiment of a rod element, aconnecting agent and an interface element, which interface element mayserve as a coupling for a reaming tool.

FIG. 2 illustrates an exemplary embodiment of the rod element, theconnecting agent and an interface element, which interface element mayserve as a coupling to a drive.

FIGS. 3 a and 3 b illustrate the separated components of a reamingdevice according to an exemplary embodiment.

FIGS. 4 a and 4 b illustrate the mounted components of FIGS. 3 a and 3 baccording to an exemplary embodiment.

FIGS. 5 a, 5 b, 5 c and 5 d illustrate a rod element having a connectingportion according to an exemplary embodiment.

FIGS. 6 a, 6 b, 6 c and 6 d illustrate a rod element having a connectionportion according to an exemplary embodiment.

FIGS. 7 a, 7 b, 7 c, 7 d, 7 e and 7 f illustrate an interface elementserving as a coupling for a reaming tool according to an exemplaryembodiment.

FIGS. 8 a, 8 b, 8 c and 8 d illustrate an interface element serving as acoupling to a drive according to an exemplary embodiment.

FIGS. 9 a, 9 b, 9 c and 9 d illustrate an interface element serving as acoupling to a drive according to an exemplary embodiment.

DETAILED DESCRIPTION OF EXEMPLARY EMBODIMENTS

FIG. 1 illustrates an exemplary embodiment of the coupling of the rodelement 10 and the interface element 20 by means of a connecting agent40. The rod element 10 may be provided with a conduit 16. The rodelement according to the illustrated embodiment comprises a first recess13 and a third recess 15, which are formed as spherical holes. In thisembodiment, the holes are blind holes, so that the sealing of theconduit 16 may be upheld in the region of the holes or recesses. Itshould be noted the recesses may also be through holes. The rod element10 is provided with a connection portion 11. The interface element 20 inthis embodiment is provided with a fourth, fifth and sixth recess 23,24, 25. The recesses may be provided on displaced locations with respectto the longitudinal axis 18 of the rod element, which corresponds to thelongitudinal axis of the interface element 28 in this embodiment.

As can be seen, recess 23 is displaced in the longitudinal direction 28to the recess 25. The same is valid for the recesses 13 and 15, whichare displaced to each other with respect to the longitudinal axis 18 ofthe rod element 10. The recesses of the interface element 20 areprovided as bore holes. It should be noted that the recesses may also bedisplaced with respect to a circumferential direction of the interfaceelement 39, as can be seen from the recesses 23 and 24, which aredisplaced by about 180°, however any other degree of displacement may beapplied according to need. Although FIG. 1 does not illustrate thecircumferential displacement of recesses of the rod element 10 into acircumferential direction 19, it should be noted that also recesses maybe provided, which are displaced with respect to the circumferentialdirection 19 of the rod element 10. The interface element 20 is providedwith a second connecting portion 21 which corresponds to the firstconnecting portion 11 of the rod element 10. A connecting agent 40 isprovided between the concentrically arranged first connecting portion 11of the rod element 10 and the second connecting portion 21 of theinterfacing element 20. In the illustrated embodiment, the connectingagent 40 engages into the recesses 13, 15, 23, 24 and 25, so that animproved force transfer between the rod element 10 and the interfaceelement 20 may be provided. However, it should be noted that if theforce transfer between the rod element 10 and the interface element 20is sufficient, the contact agent 40 does not have to engage into therecesses, even if the recesses are provided. In this case, it should benoted, that the recesses may also be left out.

FIG. 2 illustrates a reaming device 1 having a rod element 10 and aninterface element 30, wherein the rod element 10 and the interfaceelement 30 are concentrically arranged at least in the first connectingportion 11 and the second connecting portion 31. FIG. 2 illustratesrecesses on the outer surface 12 of the rod element 10, which are formedas grooves extending into the longitudinal direction 18 of the rodelement 10. The longitudinal direction 18 of the rod element 10 and thelongitudinal direction 38 of the interface element 30 correspond to eachother in the present embodiment. The recesses 13, 14 and 15 provided onthe surface 12 of the rod element 10 are displaced with respect to thelongitudinal direction 18 of the rod element 10, as well as they aredisplaced with respect to the circumferential direction 19 of the rodelement 10. The rod element 10 and the interface element 30 areconcentrically arranged in the first connecting portion 11 of the rodelement 10 and the second connecting portion 31 of the interface element30. The illustrated rod element 10 comprises a conduit 16 whichcorresponds to a conduit 36 of the interface element 30, so that atransport of a medical agent or tissue may be carried out. A connectingagent 40 is provided between the rod element 10 and the interfaceelement 30, wherein the connecting agent 40 may engage into the recesses13, 14 and 15. Thus, an improved force transfer may take place betweenthe interface element 30 and the rod element 10.

If, for example, leaving out the fourth, fifth and sixth recess on thedriving side interface element 30 of FIG. 2 a predetermined breakingpoint may be provided, since the force transfer between the interfaceelement 30 and the rod element 10 may be limited, so that if extendingthe applied forces, the connection by the connecting agent 40 betweenthe rod element 10 and the interface element 30 intendedly will break,so that a break of the rod element 10 as such and a break between therod element 10 and the reaming tool sided interface element 20 of FIG. 1may be avoided, so that the predetermined breaking point is providedoutside the human body for every operation situation.

FIG. 3 a and FIG. 3 b illustrate as a side view (FIG. 3 a) and across-sectional view (FIG. 3 b) of the several components of a reamingdevice 1 having a rod element 10 and two interface elements 20, 30. Theconnecting agent 40 is not illustrated in FIGS. 3 a and 3 b. As can beseen from FIG. 3 b, the provision of a conduit in all components 10, 20,30 provides a connection to deliver any medical agent or to removetissue from the reaming tool (not shown).

FIG. 4 a and FIG. 4 b illustrate the assembled reaming device 1 having arod element 10 and two interface elements 20, 30. As can be seen fromthe cross-sectional view in FIG. 4 b, the rod element 10 and theinterface elements 20, 30 are concentrically arranged such that theconnecting portion of the interface elements 20, 30 cover the respectiveconnecting portions of the rod element 10.

FIGS. 5 a, 5 b, 5 c and 5 d illustrate the rod element 10, and inparticular the connecting portion 11 of the rod element 10. In theconnecting portion 11 of the rod element 10, there may be providedrecesses 13, 14 and 15, wherein the recesses may be displaced withrespect to the longitudinal direction, as can be seen in FIG. 5 a, ormay be displaced in a circumferential direction, as can be seen fromFIG. 5 b, which is rotated by 90° over the illustration of FIG. 5 a.

Further, FIG. 5 a illustrates an exemplary embodiment of the carbonfibre layers, wherein the first and second carbon fibre layer 17 a, 17 bmay be provided as an interwoven structure, as can be seen from FIG. 5b. The interwoven structure may be surrounded by a third layer 17 c,which is wound in the circumferential direction of the rod element 10.The circumferential winding in particular is relevant if applying apress fitting between the interface elements 20, 30 and the rod element10. FIG. 5 c illustrates a cross-sectional view along the cut A-A,wherein FIG. 5 d illustrates an enlarged cross-sectional view of FIG. 5c showing some more details. FIG. 5 d illustrates an exemplaryembodiment of a recess 13, 14, 15, which is formed as a spherical hole.It should be noted that a spherical hole should also be understood as ahole formed by a part of a sphere, as can be seen from FIG. 5 d.Further, the recesses 13, 14, 15, 23, 24, 25, 33, 34, 35 may have anyother form, e.g. a cylindrical form or a form without sharp notches.This however is not limited to spherical holes.

FIGS. 6 a, 6 b, 6 c and 6 d illustrate a further exemplary embodiment,illustrating recesses 13, 14, 15 on the surface side of the rod element10, which recesses are formed as grooves into a longitudinal directionof the rod element 10. The grooves may be displaced with respect to thelongitudinal axis of the rod element 10, as can be seen from FIG. 6 b,as well as displaced into a circumferential direction, as can be seenfrom FIG. 6 a, which illustrates a view of the rod element of FIG. 6 bbeing rotated by 90°. FIG. 6 c illustrates a cross-sectional view ofFIG. 6 a, and FIG. 6 d illustrates an enlarged cross-sectional view ofthe rod element shown in FIG. 6 c. As can be seen from FIG. 6 d, therecesses 13, 14 and 15 may have a cross-section in form of a circlesector in order to avoid sharp notches or sharp chamfers in order toavoid a damage of the rod element 10 when transferring forces.

FIG. 6 a illustrates further a first layer 17 a and a second layer 17 bof the carbon fibres, wherein the carbon fibres in the embodiment ofFIG. 6 a are wound in separate layers. It should be noted that also anyother arrangement of the first and second layer 17 a and 17 b may beprovided, in particular any other woven pattern may be used, where it isappropriate and necessary for the respective application according toneed. The number of layers is however not limited to a first and secondlayer, and may be also a multi layer structure.

FIGS. 7 a, 7 b, 7 c, 7 d, 7 e and 7 f illustrate an interface element20, which is adapted to couple a reaming tool. The coupling of thereaming tool takes place at the head of the interface element 20, adetail of which is illustrated in FIG. 7 e. The second connectingportion 21 of the interface element 20 may be provided with a pluralityof recesses 13, 14 and 15, which may be displaced into an axialdirection as well as a circumferential direction, as can be seen fromFIG. 7 a and the corresponding cross-sectional view of FIG. 7 b. Theinterface element 20 may also be provided with a conduit 26 which mayprovide a connection between the conduit of a rod element 16 (not shownin any of the FIGS. 7 a, 7 b, 7 c, 7 d and 70 to a conduit of a reamingtool (also not shown).

FIG. 7 c illustrates a top view of the illustration of FIG. 7 a. FIG. 7d illustrates a cross-sectional view of the interface element 20,rotated by 90° over the illustration of FIG. 7 b. FIG. 7 f illustrates athree-dimensional view of the interface element 20.

FIGS. 8 a, 8 b, 8 c and 8 d illustrate a further exemplary embodiment ofan interface element, however this interface element is adapted tocouple a drive for driving the reaming device. FIG. 8 a illustrates aside view of the exemplary interface element 30. FIG. 8 c illustrates atop view of the interface element 30 shown in FIG. 8 a. FIG. 8 billustrates a cross-sectional view of the interface element 30 of FIG. 8a, wherein the interface element 30 is also provided with a conduit 36into a longitudinal direction. The connecting portion 31 comprises aplurality of recesses 33, 34, 35, which recesses may be provided asblind holes as well as through-holes (not shown). The recesses may beformed as cylindrical holes as well as spherical holes (not shown). Therecesses 33, 34, 35 may be provided on the inner surface 32 of a borehole, which bore hole is adapted to receive the connecting portion 11 ofthe rod element 10. FIG. 8 d illustrates a three-dimensional view of theinterface element 30 according to an exemplary embodiment.

FIGS. 9 a, 9 b, 9 c and 9 d illustrate a further exemplary embodiment ofan interface element 30, which is adapted to be coupled to a drive. FIG.9 a illustrates a side view, FIG. 9 c illustrates an enlarged top view,and FIG. 9 b illustrates a cross-sectional view of the interface element30. FIG. 9 d illustrates a three-dimensional view of the interfaceelement 30.

The interface elements of FIGS. 8 a, 8 b, 8 c and 8 d differ from theinterface elements of FIGS. 9 a, 9 b, 9 c and 9 d in that they provide adifferent coupling geometry for a drive, which may be specified withrespect to the supplier of the drive unit. Thus, it should be noted thatthe design of the coupling geometry may be modified with respect to thedrive unit to be coupled to the interface element 30.

It should be noted that the term ‘comprising’ does not exclude otherelements and the ‘a’ or ‘an’ does not exclude a plurality. Also elementsdescribed in association with the different embodiments may be combined.

It should be noted that the reference signs in the Claims shall not beconstrued as limiting the scope of the Claims.

1. A reaming device comprising: a rod element; an interface element; anda connecting agent; wherein the rod element comprises a first connectingportion having a carbon fibre reinforced structure; wherein theinterface element comprises a second connecting portion; wherein thefirst connecting portion and the second connecting portion areconcentrically arranged to each other; and wherein the connecting agentis interposed between the first connecting portion and the secondconnecting portion.
 2. The reaming device of claim 1, wherein the firstconnecting portion is provided on an outer surface of the rod element,and the second connecting portion is provided on an inner surface of theinterface element.
 3. The reaming device of claim 1, wherein the firstconnecting portion comprises a first recess (13), wherein the connectingagent engages into the first recess.
 4. The reaming device of claim 3,wherein the first portion comprises a second recess, wherein the firstrecess and the second recess are displaced to each other in an axialdirection of the rod element, wherein the connecting agent engages intothe second recess.
 5. The reaming device of claim 3, wherein the firstportion comprises a third recess, wherein the first recess and the thirdrecess are displaced to each other in an circumferential direction ofthe rod element, wherein the connecting agent engages into the thirdrecess.
 6. The reaming device of claim 1, wherein the interface elementcomprises a forth recess, wherein the connecting agent engages into theforth recess.
 7. The reaming device of claim 6, wherein the interfaceelement comprises a fifth recess, wherein the forth recess and the fifthrecess are displaced in an axial direction of the interface element,wherein the connecting agent engages into the fifth recess.
 8. Thereaming device of claim 6, wherein the interface element comprises asixth recess, wherein the forth recess and the sixth recess aredisplaced in an circumferential direction of the interface element,wherein the connecting agent (40) engages into the sixth recess.
 9. Thereaming device of claim 3, wherein at least one of the recesses isformed in a shape of a spherical hole.
 10. The reaming device of claim3, wherein at least one of the recesses is formed in a shape of agroove, which groove extends into a longitudinal direction of the rodelement.
 11. The reaming device of claim 6, wherein at least one recessforms a through hole in the interface element.
 12. The reaming device ofclaim 1, wherein the interface element is adapted to couple a reamingtool to the rod element.
 13. The reaming device of claim 1, wherein therod element comprises a first conduit extending in a substantiallylongitudinal direction of the rod element.
 14. The reaming device ofclaim 13, wherein the interface element comprises a second conduit,which conduit being connected to the first conduit of the rod element.15. The reaming device of claim 1, wherein the rod element is made froma carbon fibre composite.
 16. The reaming device of claim 1, wherein thecarbon fibres are wound in at least a first layer and a second layer,the direction of the first layer and the second layer are inclined at anangle of substantially plus/minus 45°, respectively, with respect to anlongitudinal axis of the rod element.
 17. The reaming device of claim 1,wherein the connecting agent is an adhesive.
 18. The reaming device ofclaim 17, wherein the connecting agent is a thermal hardening adhesive.19. The reaming device of claim 1, wherein the connecting agent is amultiple component epoxy resin.
 20. The reaming device of claim 16,wherein the connecting agent is a third layer of carbon fibre, whichthird layer is wound around the first layer and second layer, whereinthe third layer is wound into a circumferential direction of the rodelement.